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3.1.2
Hyperspectral tracker (Fs-Ikea)
The Hyperspectral tracker is a narrow field of view hyperspectral pushbroom imager. The instrument
composes of two parts: an all-sky scanner and a spectrograph (see Figure 3.2).
Figure 3.2: Panel (A): The Fs-Ikea spectrograph with its protective covers off. (1) Front lens, (2) Slit
housing, (3) Collimator, (4) Flat surface mirror, (5) Reflective grating, and (6) Camera lens. Panel (B):
All-Sky scanner. Image from KHO (2014a).
The spectral range of the instrument is between 420 and 700 nm, with a bandpass of approximately 1 nm.
The exposure time for one spectrogram is approximately 1 s. One of the possible lenses to be used is a
Carl Zeiss Planar 85mm ZF with the relative aperture f/1.4.
The all-sky scanner is composed of two first surface mirrors, mounted on two stepper motors. The azimuth
range of the instrument is 360◦ , while the zenith angle range is ±90◦ . The resolution of the motion is
0.0003◦ with an accuracy of ±0.05◦ . See more at KHO (2014a).
3.1.3
Instrument constructed on the PTU D46 platform
The PTU D46 is a pan-tilt unit suitable to point any instrument weighing up to 1.08 kg, in a range ±159◦
in azimuth and 31◦ down and 47◦ up in elevation with resolution of 0.0129◦ (Directed Perception 2007).
This unit is used widely at KHO, mainly pointing cameras with different lenses. One example for its use is
the Tracker Camera, a mount of the Watec LCL-217HS colour and the Watec 902B monochrome camera
on a PTU D46 unit. The lenses used are 30 mm Computar TV Lens with a relative aperture f/1.3 (for the
colour camera) and a 75 mm Computar lens with f/1.4 (for the monochrome camera). This instrument
is used to provide a live feed on the internet at the KHO web page (KHO 2014e). See Figure 3.3 for an
image of the Tracker Camera and the PTU D46 unit.
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